A bus protection circuit and smart home system

Abstract

The present invention is applicable to the field of protection circuit technology and provides a bus protection circuit and a smart home system. The bus protection circuit includes a power supply module, a master control module and at least one functional module. The power supply module includes a power input terminal, a power supply circuit and a current limiting protection circuit connected in sequence. The master control module includes a first communication bus protection circuit and an intelligent master control circuit connected thereto. When a first power line is short-circuited with a first communication interface, a second power interface or a second communication interface, the current limiting protection circuit, the first power protection circuit and the second communication bus protection circuit form a leakage circuit to ensure that the voltage value of the interface short-circuited with the first power line is within a safe voltage range, thereby solving the problem of burning of the connected circuit due to incorrect wiring of the IO control port or communication port of the smart home product proposed by the present invention with the power bus.

Description

Technical Field

[0001] The present invention belongs to the technical field of protection circuits, and in particular relates to a bus protection circuit and a smart home system. Background Art

[0002] With the development of smart homes, the coordination and linkage of multiple smart homes have gradually become mainstream. At this time, multiple smart homes adopt a parallel connection method on the communication bus and the power bus, and realize linkage by controlling signal transmission and signal feedback through the communication bus, and realize rational wiring by unified power supply through the power bus.

[0003] During the aforementioned linkage and wiring process, especially in the field of smart windows, smart home products that require local coordinated control, such as multi-motor coordination of electric windows or coordination between windows and curtains, require a DC power supply, IO control port, or communication port for coordinated control. Motor products generally require a DC power supply of 12V or above, while the effective voltage level of the IO control port or communication port is generally 3.3V or below. If technicians fail to carefully distinguish between these two situations, the product circuit may be directly burned out in the following two situations:

[0004] Case 1: The positive and negative poles of the power bus are connected to the power port of the smart home product in reverse;

[0005] Case 2: The power bus is mixed or short-circuited with the IO control port or communication port of the smart home. Summary of the Invention

[0006] In view of this, embodiments of the present invention provide a bus protection circuit and a smart home system to solve the technical problem of circuit burnout caused by incorrect wiring between the IO control port or communication port of a smart home product and the power bus.

[0007] To achieve the above objectives, the present application proposes a bus protection circuit, which includes:

[0008] A power supply module, the power supply module comprising a power input terminal, a power supply circuit, and a current limiting protection circuit connected in sequence; and outputting a working power supply through a first power line and a second power line connected to the current limiting protection circuit;

[0009] A master control module, comprising a first communication bus protection circuit and an intelligent master control circuit connected thereto, and outputting a function control signal via a first communication line and a second communication line connected to the first communication bus protection circuit;

[0010] at least one functional module, the functional module including a first power protection circuit, a second communication bus protection circuit, a function control circuit, a first power interface, a second power interface, a first communication interface, and a second communication interface, the function control circuit being connected to the first power protection circuit and the second communication bus protection circuit, respectively; the first power protection circuit being connected to the first power interface and the second power interface, respectively; and the second communication bus protection circuit being connected to the first communication interface and the second communication interface, respectively;

[0011] When the functional module is working normally, the first power line is connected to the first power interface, the second power line is connected to the second power interface, the first communication line is connected to the first communication interface, and the second communication line is connected to the second communication interface;

[0012] The current limiting protection circuit, the first power supply protection circuit and the second communication bus protection circuit are used to form a leakage circuit when the first power line is short-circuited with any one of the first communication interface, the second power supply interface or the second communication interface, so that the voltage value of the interface short-circuited with the first power line is within a safe voltage range.

[0013] Optionally, the current limiting protection circuit is used to stop outputting working power to the master control module and the functional module when the first power line is connected to the second power interface.

[0014] Optionally, the first power supply protection circuit and the second communication bus protection circuit are used to form a leakage circuit when the first power line is connected to the first communication interface, so that the voltage value of the first communication interface is within a safe voltage range.

[0015] Optionally, the first power supply protection circuit and the second communication bus protection circuit are used to form a leakage circuit when the first power line is connected to the second communication interface, so that the voltage value of the second communication interface is within a safe voltage range.

[0016] Optionally, the function control circuit includes any one or more of a motor control circuit and a smart window operation control circuit.

[0017] Optionally, the first communication bus protection circuit includes a first self-recovery insurance branch, a second self-recovery insurance branch, a first surge branch, a first anti-reverse connection branch and a first anti-static branch, the first end of the first self-recovery insurance branch is connected to the first communication line of the master control module, the second end of the first self-recovery insurance branch is respectively connected to the first end of the first surge branch and the first end of the first anti-static branch; the second end of the first surge branch is respectively connected to the first end of the second self-recovery insurance branch and the first end of the first anti-reverse connection branch; the second end of the second self-recovery insurance branch is connected to the second communication line of the master control module; the second end of the first anti-reverse connection branch and the second end of the first anti-static branch are grounded.

[0018] Optionally, the first power protection circuit includes a reverse connection protection circuit and a surge electrostatic protection circuit, the first end of the reverse connection protection circuit and the first end of the surge electrostatic protection circuit are connected to the first power interface of the functional module to receive a forward working power supply; the second end of the reverse connection protection circuit is grounded; the second end of the surge electrostatic protection circuit is connected to the second power interface of the functional module to receive a reverse working power supply.

[0019] Optionally, the second communication bus protection circuit includes a third self-recovery insurance branch, a fourth self-recovery insurance branch, a second surge branch, a second anti-reverse polarity branch and a second anti-static branch, the first end of the third self-recovery insurance branch is connected to the first communication interface of the functional module, the second end of the third self-recovery insurance branch is respectively connected to the first end of the second surge branch and the first end of the second anti-static branch; the second end of the second surge branch is respectively connected to the first end of the fourth self-recovery insurance branch and the first end of the second anti-reverse polarity branch; the second end of the fourth self-recovery insurance branch is connected to the second communication interface of the functional module; the second end of the second anti-reverse polarity branch and the second end of the second anti-static branch are grounded.

[0020] Optionally, the current limiting protection circuit includes a current detection chip, a first resistor, a second resistor, a third resistor, a first transistor and a second transistor. The current detection chip includes a detection end, an output end and a common end. The first end of the first resistor is connected to the detection end of the current detection chip and is connected to the first power line to detect the current value of the working power supply. The second end of the first resistor is respectively connected to the controlled end of the first transistor and the first end of the second transistor; the first end of the first transistor is connected to the output end of the current detection chip, and the second end of the first transistor is connected to the positive pole of the system power supply; the second end of the second transistor is connected to the first end of the second resistor, and the connection node thereof is connected to the negative pole of the system power supply. The controlled end of the second transistor is respectively connected to the second end of the second resistor and the first end of the third resistor; the second end of the third resistor is connected to the common end of the current detection chip.

[0021] To achieve the above objectives, the present application also proposes a smart home system, which includes the bus protection circuit as described above.

[0022] In an embodiment of the present invention, a current limiting protection circuit, a first power supply protection circuit, and a second communication bus protection circuit are used to form a leakage circuit between the current limiting protection circuit, the first power supply protection circuit, and the second communication bus protection circuit when the first power line is short-circuited with any one of the first communication interface, the second power interface, or the second communication interface. This ensures that the voltage value of the interface short-circuited with the first power line is within a safe voltage range, thereby resolving the technical problem of circuit burnout caused by incorrect wiring between the IO control port or communication port and the power bus of a smart home product. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0024] Figure 1 1 is a schematic diagram of a module of a bus protection circuit provided by an embodiment of the present invention;

[0025] Figure 2 1 is a circuit diagram of a first short-circuit condition of a bus protection circuit provided by an embodiment of the present invention;

[0026] Figure 3 1 is a circuit diagram of a second short-circuit condition of the bus protection circuit provided by an embodiment of the present invention;

[0027] Figure 41 is a circuit diagram of a third short-circuit condition of the bus protection circuit provided by an embodiment of the present invention;

[0028] Figure 5 1 is a circuit diagram of a fourth short-circuit condition of the bus protection circuit provided by an embodiment of the present invention;

[0029] Figure 6 1 is a circuit diagram of a fifth short-circuit condition of the bus protection circuit provided by an embodiment of the present invention;

[0030] Figure 7 It is a schematic diagram of a power protection circuit in a bus protection circuit provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0031] In order to enable those skilled in the art to better understand the solutions of the present invention, the technical solutions in the embodiments of the present invention will be clearly described below in conjunction with the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts should fall within the scope of protection of the present invention.

[0032] The term "comprises" and any variations thereof in the specification and claims of the present invention and the accompanying drawings are intended to cover non-exclusive inclusions. For example, a process, method, system, product, or apparatus comprising a series of steps or elements is not limited to the listed steps or elements, but may optionally include steps or elements not listed, or may optionally include other steps or elements inherent to the process, method, product, or apparatus.

[0033] In order to solve the technical problem of circuit burnout caused by incorrect wiring between the IO control port or communication port and the power bus of smart home products, the present invention proposes a bus protection circuit and a smart home system.

[0034] In an optional embodiment, the bus protection circuit includes a power supply module 10, a master control module 30, and at least one functional module 20. The power supply module 10 includes a power input terminal 103, a power supply circuit 104, and a current limiting protection circuit 101, which are connected in sequence. The current limiting protection circuit 101 also includes a first power line VCC and a second power line GND. The master control module 30 includes a first communication bus protection circuit 102 and an intelligent master control circuit 105, which are connected to each other. The master control module 30 also includes a first communication line D+ and a second communication line D-, which are connected to the first communication bus protection circuit 102. The functional module 20 includes a first power protection circuit 201, a second communication bus protection circuit 202, a function control circuit 203, a first power interface V2, a second power interface sGND, a first communication interface D2a and a second communication interface D2b. The function control circuit 203 is respectively connected to the first power protection circuit 201 and the second communication bus protection circuit 202. The first power protection circuit 201 is respectively connected to the first power interface V2 and the second power interface sGND. The second communication bus protection circuit 202 is respectively connected to the first communication interface D2a and the second communication interface D2b.

[0035] The power supply module 10 outputs a working power supply through ; the master control module 30 outputs a function control signal.

[0036] When the functional module 20 is working normally, the first power line VCC is connected to the first power interface V2, the second power line GND is connected to the second power interface sGND, the first communication line D+ is connected to the first communication interface D2a, and the second communication line D- is connected to the second communication interface D2b.

[0037] When the first power line VCC is short-circuited with any of the first communication interface D2a, the second power interface sGND, or the second communication interface D2b, the current limiting protection circuit 101, the first power protection circuit 201, and the second communication bus protection circuit 202 form a current leakage circuit with the first power line VCC, the first communication interface D2a, the second power interface sGND, or the second communication interface D2b, thereby keeping the voltage of the interface short-circuited with the first power line VCC within a safe voltage range. This short-circuiting solution ensures that the voltage of the interface short-circuited with the first power line VCC remains within a safe voltage range, thereby resolving the technical problem of circuit burnout caused by incorrect wiring between the IO control port or communication port and the power bus of smart home products.

[0038] The safe voltage range at this time is less than or equal to the operating voltage of the first communication interface D2a or the second communication interface D2b, and may also be equal to zero.

[0039] It should be noted that in this application, the first power line VCC and the second power line GND are directly defined as the positive pole and the negative pole of the power supply for the convenience of explaining the principle. However, in actual installation, the two can be swapped by changing the corresponding connection relationship according to the principle of the present invention. No further details will be given here.

[0040] It should be noted that, in the above embodiment, the power supply module 10 and the master control module 30 can be integrated together to facilitate production, or they can exist as separate modules to facilitate assembly and testing.

[0041] The following are detailed descriptions of several short circuit situations:

[0042] In the first short circuit situation, refer to Figure 3 As shown, when the first power line VCC is connected to the second power interface sGND, the current limiting protection circuit 101 stops outputting working power to the master control module 30 and the functional module 20. That is, the voltage value of the second power interface sGND is within the safe voltage range and is equal to zero.

[0043] In the second short circuit situation, refer to Figure 5 As shown, when the first power line VCC is connected to the first communication interface D2a, a leakage circuit is formed through the second power interface sGND, the first power protection circuit 201, the second communication bus protection circuit 202, and the first communication interface D2a to ensure that the voltage value of the first communication interface D2a is within a safe voltage range.

[0044] In the third short circuit situation, refer to Figure 4 As shown, when the first power line VCC is connected to the second communication interface D2b, and the second power line GND is connected to the first communication interface D2a, the first communication line D+ is connected to the second power interface sGND, and the second communication line D- is connected to the first power interface V2, the first communication interface D2a is connected, the first power protection circuit 201, the second communication bus protection circuit 202 and the second communication interface D2b form a leakage circuit to ensure that the voltage value of the second communication interface D2b is within a safe voltage range.

[0045] In the fourth short circuit situation, refer to Figure 6 As shown, when the first power line VCC is connected to the second communication interface D2b, the second power line GND is connected to the first power interface V2, the first communication line D+ is connected to the first communication interface D2a, and the second communication line D- is connected to the second power interface sGND, the first power interface V2, the first power protection circuit 201, the second communication bus protection circuit 202 and the second communication interface D2b form a leakage circuit to ensure that the voltage value of the second communication interface D2b is within a safe voltage range.

[0046] Optionally, the function control circuit includes any one or more of a motor control circuit and a smart window operation control circuit.

[0047] The motor control circuit may be a commonly used motor control driver or a commonly used motor control circuit in the prior art. The smart window operation control circuit may be various smart window function modules, such as a temperature detection module, a brightness detection module, and the like.

[0048] Optionally, the first communication bus protection circuit 102 includes a first self-recovery insurance branch, a second self-recovery insurance branch, a first surge branch, a first anti-reverse polarity branch and a first anti-static branch, the first end of the first self-recovery insurance branch is connected to the first communication line D+ of the master control module 30, the second end of the first self-recovery insurance branch is respectively connected to the first end of the first surge branch and the first end of the first anti-static branch; the second end of the first surge branch is respectively connected to the first end of the second self-recovery insurance branch and the first end of the first anti-reverse polarity branch; the second end of the second self-recovery insurance branch is connected to the second communication line D- of the master control module 30; the second end of the first anti-reverse polarity branch and the second end of the first anti-static branch are grounded.

[0049] The first and second resettable fuse branches can switch between an extremely low resistance state and a thermal protection state to ensure the voltage remains at a safe level. The first surge branch and the first reverse connection protection branch only allow unidirectional current flow, preventing reverse current flow in the event of reverse connection and further reducing surge current. The first anti-static branch can conduct electricity in both directions, reducing the generation of static electricity.

[0050] Optionally, the first self-recovery insurance branch and the second self-recovery insurance branch can be implemented by using small-capacity PTC self-recovery insurance resistors PTC11 and PTC12.

[0051] Optionally, the first anti-reverse connection branch and the first anti-static branch are generally diodes TVS11 and TVS13 connected in series in the forward direction (or MOS tubes with unidirectional conduction), and their connection relationship can be referred to Figure 3 、 Figure 4 、 Figure 5 、 Figure 6 The connection is as shown, and a unidirectional TVS diode can also be used to achieve it.

[0052] Optionally, the first surge branch can be implemented using a bidirectional TVS diode TVS12.

[0053] Optionally, the first power protection circuit 201 includes a reverse connection protection circuit and a surge electrostatic protection circuit, and the first end of the reverse connection protection circuit and the first end of the surge electrostatic protection circuit are connected to the first power interface V2 of the functional module 20 to receive a forward working power supply; the second end of the reverse connection protection circuit is grounded; the second end of the surge electrostatic protection circuit is connected to the second power interface sGND of the functional module 20 to receive a reverse working power supply.

[0054] Among them, the reverse connection protection circuit and the surge electrostatic protection circuit ensure that the power circuits in the motor control driver and other functional modules will not be damaged when the first power line VCC, the second power line GND and the first power interface V2, the second power interface sGND are reversely connected.

[0055] Optionally, the reverse connection protection circuit can be implemented using a unidirectional TVS diode DX.

[0056] Optionally, the electrostatic surge protection circuit may be implemented using a bidirectional TVS diode TVS24.

[0057] Optionally, the second communication bus protection circuit 202 includes a third self-recovery insurance branch, a fourth self-recovery insurance branch, a second surge branch, a second anti-reverse polarity branch and a second anti-static branch, the first end of the third self-recovery insurance branch is connected to the first communication interface D2a of the functional module 20, the second end of the third self-recovery insurance branch is respectively connected to the first end of the second surge branch and the first end of the second anti-static branch; the second end of the second surge branch is respectively connected to the first end of the fourth self-recovery insurance branch and the first end of the second anti-reverse polarity branch; the second end of the fourth self-recovery insurance branch is connected to the second communication interface D2b of the functional module 20; the second end of the second anti-reverse polarity branch and the second end of the second anti-static branch are grounded.

[0058] The third and fourth resettable fuse branches can switch between an extremely low resistance state and a thermal protection state to ensure the voltage remains at a safe level. The second surge branch and the second reverse polarity protection branch only allow unidirectional current flow, preventing reverse current flow in the event of reverse polarity, further reducing surge current. The second anti-static branch can conduct electricity in both directions, reducing the generation of static electricity.

[0059] Optionally, the third self-recovery insurance branch and the fourth self-recovery insurance branch can be implemented by using small-capacity PTC self-recovery insurance resistors PTC21 and PTC22.

[0060] Optionally, the second anti-reverse branch and the second anti-static branch are generally diodes connected in series in the forward direction (or MOS tubes with unidirectional conduction), and their connection relationship can be referred to Figure 3 、 Figure 4 、 Figure 5 、 Figure 6The connection is as shown, or unidirectional TVS diodes TVS21 and TVS23 can be used to achieve this.

[0061] Optionally, the second surge branch may be implemented using a bidirectional TVS diode TVS22 .

[0062] Optionally, refer to Figure 7 As shown, the current limiting protection circuit 101 includes a current detection chip U1, a first resistor R1, a second resistor R2, a third resistor R3, a first transistor Q1, and a second transistor Q2. The current detection chip includes a detection terminal, an output terminal OUT, and a common terminal CON. The first terminal of the first resistor R1 is connected to the detection terminal of the current detection chip and is connected to the first power line to detect the current value of the working power supply. The second terminal of the first resistor R1 is respectively connected to the controlled terminal of the first transistor Q1 and the first terminal of the second transistor Q2; the first terminal of the first transistor Q1 is connected to the output terminal of the current detection chip, and the second terminal of the first transistor Q1 is connected to the positive electrode V+ of the system power supply; the second terminal of the second transistor Q2 is connected to the first terminal of the second resistor R2, and the connection node thereof is connected to the negative electrode V- of the system power supply; the controlled terminal of the second transistor Q2 is respectively connected to the second terminal of the second resistor R2 and the first terminal of the third resistor R3; and the second terminal of the third resistor R3 is connected to the common terminal of the current detection chip U1.

[0063] In the above scheme, the current-sensing chip U1 detects the current value of the working power supply VCC. When the current value reaches the current threshold set by the circuit design, the current-sensing chip U1 will shut down the system power supply, so that the circuits that subsequently require the working power supply VCC will not be supplied with working power, thereby achieving system circuit protection. When the current value is lower than the current threshold, the current-sensing chip U1 will automatically turn on the system power supply to ensure the working power supply. Furthermore, the configuration of the first transistor Q1 and the second transistor Q2 can make the process of turning the system power on and off more reliable, and the two transistors complement each other. The first transistor Q1 and the second transistor Q2 can be implemented using NMOS transistors or PMOS transistors according to different needs.

[0064] In an optional embodiment, the first transistor Q1 may be implemented by a PMOS transistor, and the second transistor Q2 may be implemented by an NMOS transistor.

[0065] When the current detection chip U1 detects that the current exceeds the preset safety threshold, that is, the current threshold, the common end of the current detection chip U1 outputs a low level to control the second transistor Q2 to disconnect. At the same time, the first transistor Q1 receives a high level and is also disconnected, thereby completely disconnecting the system power supply and achieving reliable protection.

[0066] The following combination Figure 1 、 Figure 2 、 Figure 3 、 Figure 4 、 Figure 5 、 Figure 6 、 Figure 7 The working principle of the present invention is described in detail:

[0067] In the first case, refer to Figure 3 As shown, when the first power line VCC is mistakenly connected to the second power interface sGND, and the second power line GND is mistakenly connected to the first communication interface D2a or the second communication interface D2b, the first power line VCC, the second communication interface D2b, PTC22->unidirectional TVS22 tube->PTC21->first communication interface D2a->second power line GND form a loop. At this time, PTC22 and PTC21 are in an extremely low resistance state, and the instantaneous large current stimulates the current detection chip U1 in the power protection circuit (fast response current limiting protection circuit 101) to enter the protection state, immediately suspending the working power output of the power supply circuit 104; at the same time, PTC22 and PTC21 are in an extremely low resistance state, and the first communication interface D2a or the second communication interface D2b will not have a voltage drop greater than that of the damaged circuit, thereby ensuring that the functional control circuit, such as the motor control driver circuit, is not damaged.

[0068] In the second case, when the first power line VCC is mistakenly connected to the first communication interface D2a, and the first communication line D+ is mistakenly connected to the first power interface V2, the first power line VCC discharges to GND through the TVS. The large current quickly triggers the heating protection of PTC21, and the PTC resistance increases rapidly, thereby ensuring that the entire motor control driver circuit does not have a high voltage higher than the TVS action voltage, thereby protecting the functional control circuits such as the motor control driver circuit from damage;

[0069] In the third case, refer to Figure 4 As shown, when the first power line VCC is mistakenly connected to the second communication interface D2b and the second communication line D- is mistakenly connected to the second power interface sGNDV2, the same protection effect is achieved as when the first power line VCC is mistakenly connected to the first communication interface D2a.

[0070] In the fourth case, refer to Figure 5 As shown, when the first power line VCC is mistakenly connected to the first communication interface D2a, and the second communication line D- is mistakenly connected to the second power interface sGND, the first power line VCC and GND form a loop through PTC21\TVS23\PTC22, and PTC21 / PTC22 quickly enters the protection state. The remaining voltage returns to the first communication interface D2a or the second communication interface D2b of the smart window controller through the second power interface sGND interface, and is protected to a safe voltage range by the protection circuit of the first communication interface D2a or the second communication interface D2b inside the smart window controller.

[0071] In the fifth case, when the first power line VCC is mistakenly connected to the second communication interface D2b, and the first communication line D+ is mistakenly connected to the second power interface sGND interface, the same protection effect is achieved as when the first power line VCC is mistakenly connected to the first communication interface D2a, and the second communication line D- is mistakenly connected to the second power interface sGND interface.

[0072] In the sixth case, when the first power line VCC is short-circuited to the second power line GND, the fast-response current-limiting protection circuit 101 of the intelligent window controller operates immediately, thereby protecting all circuits from being damaged;

[0073] In the seventh case, when the first power line VCC is short-circuited to the first communication line D+ or the second communication line D-, PTC1 or PTC2 forms an electrical loop to GND through the TVS, and the PTC quickly operates to protect the voltage of the first communication line D+ or the second communication line D- from exceeding the TVS operating voltage, thereby protecting all circuits from damage;

[0074] In the eighth case, when the second power line GND is short-circuited to the first communication line D+ or the second communication line D−, the first communication line D+ or the second communication line D− is at 0 level, which will not cause any damage to the circuit.

[0075] In the ninth case, reference Figure 6 As shown, the first power line VCC is connected to the first communication interface D2a, the second power line GND is connected to the second power interface sGND, the first communication line D+ is connected to the first power interface V2, and the second communication line D- is connected to the first communication interface D2a. The electrical circuit formed by the first communication interface D2a, PTC21, TVS21, and the second power interface sGND protects the voltage of the first communication interface D2a from being higher than the TVS action voltage, thereby protecting all circuits from damage.

[0076] As described above, the present invention can ensure that the smart window control bus will not damage connected devices even in the event of any misconnection. This not only solves the technical problem of circuit burnout caused by misconnection between the IO control port or communication port of smart home products and the power bus, but also addresses the problem of circuit damage caused by misconnection and short circuiting of the smart window control bus.

[0077] The present invention also provides a smart home system, which includes any one of the above bus protection circuits.

[0078] It should be noted that, since the smart home system of the present invention includes all embodiments of the above-mentioned bus protection circuit, the smart home system of the present invention has all the beneficial effects of the above-mentioned bus protection circuit, which will not be described in detail here.

[0079] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the various embodiments of the present invention, and should all be included in the scope of protection of the present invention.

Claims

1. A bus protection circuit, characterized in that: The bus protection circuit comprises: A power supply module, the power supply module comprising a power input terminal, a power supply circuit, and a current limiting protection circuit connected in sequence; and outputting a working power supply through a first power line and a second power line connected to the current limiting protection circuit; A master control module, comprising a first communication bus protection circuit and an intelligent master control circuit connected thereto, and outputting a function control signal via a first communication line and a second communication line connected to the first communication bus protection circuit; at least one functional module, the functional module including a first power protection circuit, a second communication bus protection circuit, a function control circuit, a first power interface, a second power interface, a first communication interface, and a second communication interface, the function control circuit being connected to the first power protection circuit and the second communication bus protection circuit, respectively; the first power protection circuit being connected to the first power interface and the second power interface, respectively; and the second communication bus protection circuit being connected to the first communication interface and the second communication interface, respectively; When the functional module is working normally, the first power line is connected to the first power interface, the second power line is connected to the second power interface, the first communication line is connected to the first communication interface, and the second communication line is connected to the second communication interface; The current limiting protection circuit, the first power protection circuit, and the second communication bus protection circuit are configured to form a current leakage circuit when the first power line is short-circuited with any one of the first communication interface, the second power interface, or the second communication interface, so as to keep the voltage value of the interface short-circuited with the first power line within a safe voltage range; The current limiting protection circuit includes a current detection chip, a first resistor, a second resistor, a third resistor, a first transistor and a second transistor. The current detection chip includes a detection end, an output end and a common end. The first end of the first resistor is connected to the detection end of the current detection chip and is connected to the first power line to detect the current value of the working power supply. The second end of the first resistor is respectively connected to the controlled end of the first transistor and the first end of the second transistor; the first end of the first transistor is connected to the output end of the current detection chip, and the second end of the first transistor is connected to the positive electrode of the system power supply; the second end of the second transistor is connected to the first end of the second resistor, and the connection node thereof is connected to the negative electrode of the system power supply. The controlled end of the second transistor is respectively connected to the second end of the second resistor and the first end of the third resistor; the second end of the third resistor is connected to the common end of the current detection chip; The first power protection circuit includes a reverse connection protection circuit and a surge electrostatic protection circuit, wherein a first end of the reverse connection protection circuit and a first end of the surge electrostatic protection circuit are connected to a first power interface of the functional module to receive a forward working power supply; a second end of the reverse connection protection circuit is grounded; and a second end of the surge electrostatic protection circuit is connected to a second power interface of the functional module to receive a reverse working power supply; The second communication bus protection circuit includes a third self-recovery insurance branch, a fourth self-recovery insurance branch, a second surge branch, a second anti-reverse connection branch and a second anti-static branch. The first end of the third self-recovery insurance branch is connected to the first communication interface of the functional module, and the second end of the third self-recovery insurance branch is respectively connected to the first end of the second surge branch and the first end of the second anti-static branch; the second end of the second surge branch is respectively connected to the first end of the fourth self-recovery insurance branch and the first end of the second anti-reverse connection branch; the second end of the fourth self-recovery insurance branch is connected to the second communication interface of the functional module; the second end of the second anti-reverse connection branch and the second end of the second anti-static branch are grounded.

2. The bus protection circuit according to claim 1, wherein: The current limiting protection circuit is used to stop outputting working power to the master control module and the functional module when the first power line is connected to the second power interface.

3. The bus protection circuit according to claim 1, wherein: The first power protection circuit and the second communication bus protection circuit are used to form a leakage circuit when the first power line is connected to the first communication interface, so that the voltage value of the first communication interface is within a safe voltage range.

4. The bus protection circuit according to claim 1, wherein: The first power supply protection circuit and the second communication bus protection circuit are used to form a leakage circuit when the first power line is connected to the second communication interface, so that the voltage value of the second communication interface is within a safe voltage range.

5. The bus protection circuit according to any one of claims 1 to 4, characterized in that: The function control circuit includes any one or more of a motor control circuit and a smart window operation control circuit.

6. The bus protection circuit according to any one of claims 1 to 4, characterized in that: The first communication bus protection circuit includes a first self-recovery insurance branch, a second self-recovery insurance branch, a first surge branch, a first anti-reverse connection branch and a first anti-static branch. The first end of the first self-recovery insurance branch is connected to the first communication line of the master control module, and the second end of the first self-recovery insurance branch is respectively connected to the first end of the first surge branch and the first end of the first anti-static branch; the second end of the first surge branch is respectively connected to the first end of the second self-recovery insurance branch and the first end of the first anti-reverse connection branch; the second end of the second self-recovery insurance branch is connected to the second communication line of the master control module; the second end of the first anti-reverse connection branch and the second end of the first anti-static branch are grounded.

7. A smart home system, characterized in that: The smart home system includes the bus protection circuit according to any one of claims 1 to 6.

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